Mercurial > hg > truffle
diff src/share/vm/memory/cardTableModRefBS.hpp @ 616:4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
6720334: G1: don't update RSets of collection set regions during an evacuation pause
Summary: Introduced a deferred update mechanism for delaying the rset updates during the collection pause
Reviewed-by: apetrusenko, tonyp
author | iveresov |
---|---|
date | Fri, 06 Mar 2009 13:50:14 -0800 |
parents | 2494ab195856 |
children | 7bb995fbd3c0 |
line wrap: on
line diff
--- a/src/share/vm/memory/cardTableModRefBS.hpp Mon Mar 02 16:37:04 2009 -0800 +++ b/src/share/vm/memory/cardTableModRefBS.hpp Fri Mar 06 13:50:14 2009 -0800 @@ -52,11 +52,15 @@ enum CardValues { clean_card = -1, + // The mask contains zeros in places for all other values. + clean_card_mask = clean_card - 31, + dirty_card = 0, precleaned_card = 1, - claimed_card = 3, - last_card = 4, - CT_MR_BS_last_reserved = 10 + claimed_card = 2, + deferred_card = 4, + last_card = 8, + CT_MR_BS_last_reserved = 16 }; // dirty and precleaned are equivalent wrt younger_refs_iter. @@ -254,9 +258,11 @@ }; static int clean_card_val() { return clean_card; } + static int clean_card_mask_val() { return clean_card_mask; } static int dirty_card_val() { return dirty_card; } static int claimed_card_val() { return claimed_card; } static int precleaned_card_val() { return precleaned_card; } + static int deferred_card_val() { return deferred_card; } // For RTTI simulation. bool is_a(BarrierSet::Name bsn) { @@ -329,7 +335,8 @@ } bool is_card_claimed(size_t card_index) { - return _byte_map[card_index] == claimed_card_val(); + jbyte val = _byte_map[card_index]; + return (val & (clean_card_mask_val() | claimed_card_val())) == claimed_card_val(); } bool claim_card(size_t card_index); @@ -338,6 +345,13 @@ return _byte_map[card_index] == clean_card_val(); } + bool is_card_deferred(size_t card_index) { + jbyte val = _byte_map[card_index]; + return (val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val(); + } + + bool mark_card_deferred(size_t card_index); + // Card marking array base (adjusted for heap low boundary) // This would be the 0th element of _byte_map, if the heap started at 0x0. // But since the heap starts at some higher address, this points to somewhere @@ -434,6 +448,10 @@ return byte_for(p) - _byte_map; } + const jbyte* byte_for_index(const size_t card_index) const { + return _byte_map + card_index; + } + void verify(); void verify_guard();